<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>a{border:1px #000 solid;
font-size:50pt;color:red;}</style>
<style>#one{font-size:10px;}
#two{front-size:20px;}
#three{front-size:30px;}</style>
<style>.1{font-family:宋体;font-size:30px;color:blue;;}
.2{font-family:宋体;font-size:40px;color:green;}</style>

</head>
<body>
<p>标记选择器</p>
<a>段落标记</a>
<p></p>
<p>id选择器</p>
<p id="one">ID1</p>
<p id="two">ID2</p>
<p id="three">ID3</p>
<p>类别选择器</p>
<h1 class="1">1</h1>
<p>内容1</p>
<h2 class="2">2</h2>
<p>内容2</p>
<p>行内</p>
<link rel="stylesheet" href="2.css" type="text/css"/>

</body>
</html>